Refrigerator

ABSTRACT

A refrigerator is disclosed. The refrigerator is able to store food at a low temperature and to effectively remove bacteria of the food stored in a storage room, to maintain the storage room clean.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a Divisional application of prior co-pending U.S.patent application Ser. No. 13/579,655 filed Aug. 17, 2012, which is aU.S. National Stage application under 35 U.S.C. §371 of PCT ApplicationNo. PCT/KR2011/007350, filed Oct. 5, 2011, which claims priority toKorean Patent Application No. 10-2010-0137690, filed Dec. 29, 2010,whose entire disclosures are hereby incorporated by reference.

BACKGROUND

1. Technical Field

The present invention relates to a refrigerator that is able to storefood at a low point of temperature and to remove bacteria of the foodstored in a storage room effectively, to maintain the storage roomclean.

2. Background Art

Generally, a refrigerator is an electric appliance that can store foodat a low temperature to preserve food fresh for a relatively long time.Based on statuses of stored items, which are the food, cold air iscontrolled to preserve them frozen or refrigerated.

The cold air supplied to the inside of the refrigerator is generated byheat exchange of refrigerant, and it is constantly supplied to theinside of the refrigerator while a cycle configured of compression,condensation, expansion and evaporation is performed repeatedly. Thesupplied refrigerant is uniformly transported into the refrigerator byconvection, such that the food located in the refrigerator may bepreserved at a desired temperature.

Such a refrigerator may be categorized, based on a structure of freezerand refrigerator compartments provided therein, into a traditional topfreezer type refrigerator, a side by side refrigerator, and a bottomfreezer type refrigerator.

The traditional top freezer type refrigerator includes a refrigeratorcompartment located on a top thereof and a refrigerator compartmentlocated at a bottom thereof. The side by side type refrigerator includesfreezer and refrigerator compartments located side by side.

The bottom freezer type refrigerators have been used a lot in NorthAmerica and Europe. Such a bottom freezer type refrigerator includes alarge-sized refrigerator compartment located on a top and a freezercompartment smaller than the refrigerator compartment located at abottom. Such a refrigerator includes a case having at least one storageroom formed therein and a door rotatably coupled to the case toselectively open and close the storage room.

The storage room of the refrigerator is typically partitioned intofreezer and refrigerator compartments. Behind the storage room may bearranged an evaporator for generating cold air by heat-exchanging withair inside the storage room and a fan for blowing the air inside thestorage room into the evaporator and for re-storing the heat-exchangedcold air into the storage room.

Moreover, a variety of functions for user convenience may be provided.To realize such functions, a home bar may be provided in the door or aplurality of baskets may be provided in a rear surface of the door, tostore or keep a proper amount of food or food containers in the door.

In such a refrigerator vegetables and fruits, fish, various foodmaterials and cooked-food may be stored. Unless the storage room iscleaned periodically, the refrigerator might be full of unpleasantsmells generated from the variety of food stored in the storage room,and bacteria and viruses might reproduce. Because of this, sanitationcould be poor and the user might have an unpleasant feeling.

Also, bacteria and the like might spread into the other food or moveinside the refrigerator along the cold air circulation. Because of this,sanitation inside the refrigerator might be poor.

DISCLOSURE OF INVENTION Technical Problem

To solve these problems, an object of the present invention is toprovide a refrigerator that is able to remove bacteria from food storedin a storage room and from air inside the storage room effectively andto maintain the storage room clean.

Another object of the present invention is to provide a refrigeratorthat is able to maintain clean a plurality of storage rooms via anauxiliary sterilization passage independent from a cold air passage.

A further object of the present invention is to provide a refrigeratorthat is able to automatically sterilize/deodorize the storage room anddecompose remnants of dead bacteria.

A still further object of the present invention is to provide arefrigerator that is able to remove allergens located in the storageroom to manage the storage room sanitarily and to keep freshness of thestored food.

A still further object of the present invention is to provide arefrigerator that is able to selectively perform sterilization based onintroduction of food, change of internal temperature, or usage of thefood to reduce power consumption.

A still further object of the present invention is to provide arefrigerator that is able to detect a kind and amount of bacteria orodor factors located in the storage room to display the detectedinformation to the user.

A still further object of the present invention is to provide arefrigerator that is able to recognize image information relating to anappearance of a specific food or distribution of temperatures to acquirefreshness of the food and to display the freshness to the user.

Technical Solution

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein, arefrigerator includes a cabinet comprising at least one storage roomprovided therein for low temperature storage; a compressor provided inthe cabinet, to compress refrigerant; at least one door to open andclose the storage room selectively; a filter module comprising a housingarranged in the storage room, with an air inlet and an air outlet formedtherein, a plurality of sterilization filters arranged in the housingand a fan; and a control unit to control the operation of the filtermodule.

The housing may include a front housing having the air inlet formedtherein; a rear housing coupled to the front housing, having the airoutlet formed therein to arrange the fan; and a front panel arranged ina front of the front housing.

The plurality of the sterilization filters may be configured of first tothird sterilization filters arranged along the air outlet from the airinlet sequentially, and the size of mesh may be getting smaller from thefirst sterilization filter to the third sterilization filter. The thirdsterilization filter may have a zebra pattern. Leuconostoc enzyme may becoated on at least one of the sterilization filters. A protein activityinhibitor may be further coated on the at least one of the sterilizationfilters.

The filter module may further include a deodorization filter todeodorize the air having passed through the sterilization filters. Thefilter module may further include an anti-allergen filter. Theanti-allergen filter may include at least one selected from a groupcomposed of activated carbon (charcoal), silver (Au), allercatcherfiber, co-phthalocyanine and Fe-phthalocyanine. The activated carbon maybe T-SCOB, T-E or T-TS impregnated charcoal.

The cabinet may include an inner case having the storage room providedtherein and an outer case defining an exterior appearance of therefrigerator, a cold air duct arranged in a space between the front caseand the rear plate to supply cold air to the storage room, and a filterduct comprising a plurality of outlets to draw the sterilized airexhausted from the filter module therein and to transport the drawnsterilized air to the storage room. A passing hole may be provided inthe inner case, corresponding to the outlets of the filter duct, and thesterilized air may be drawn into the inner case via the passing hole.

The inner case may be partitioned into a plurality of storage sections,and at least one passing hole may be provided in each of the storagesections. The cold duct and the filter duct may be connected with eachother partially, and cold air and sterilized air may be supplied to thestorage room together.

The control unit may drive the filter module for a preset time period,when a preset integrated time of the compressor passes. The control unitmay drive the filter module for a first time period and stop the filtermodule for a second time period, and the control unit may repeat thedriving and stopping of the filter module multiple times. The integratedtime of the compressor may be 5 hours and the first time period may be10 minutes and the second time period may be 5 minutes.

The control unit may drive the filter module for a preset time periodwhen the door is closed based on opening and closing of the door. Thecontrol unit may drive the filter module for a preset time period whenthe door is closed based on at least one of a frequency of dooropening/closing and a door opening time. The control unit may stop thedriving of the filter module when the door is opened during the drivingof the filter module. The control unit may stop the driving of thefilter module when a defrost operation starts during the driving of thefilter module.

In another aspect of the present invention, a refrigerator includes acabinet comprising at least one storage room provided therein for lowtemperature storage; a compressor provided in the cabinet, to compressrefrigerant; at least one door to selectively open and close the storageroom; a filter module comprising at least one UV lighting source toirradiate an ultraviolet light toward air inside the storage room and aphotocatalyst filter to filter the air having the UV light irradiatedthereto; and a control unit to control the operation of the filtermodule. Titanium may be coated on the photocatalyst filter.

The filter module may include a housing arranged in the storage room,with an air inlet and an air outlet formed therein, and a fan arrangedadjacent to the air outlet of the housing, and the UV lighting sourcemay be arranged adjacent to the air inlet within the housing and thephotocatalyst filter may be arranged adjacent to the air outlet withinthe housing.

The cabinet may include an inner case having the storage room providedtherein and an outer case defining an exterior appearance of therefrigerator, a cold air duct arranged in a space between the front caseand the rear plate to supply cold air to the storage room, and a filterduct comprising a plurality of outlets to draw the sterilized airexhausted from the filter module therein and to transport the drawnsterilized air to the storage room. A passing hole may be provided inthe inner case, corresponding to the outlets of the filter duct, and thesterilized air may be drawn into the inner case via the passing hole.The inner case may be partitioned into a plurality of storage sections,and at least one passing hole may be provided in each of the storagesections.

The UV lighting source may be operated based on at least one of a lightemission duration time, a light emission intensity, and a light emissionperiod that are memorized in the control unit. The UV lighting sourcemay be operated based on at least one of a door opening status and atemperature change of the storage room.

The filter module may further include an anti-allergen filter. Theanti-allergen filter may include at least one selected from a groupcomposed of activated carbon (charcoal), silver (Au), allercatcherfiber, co-phthalocyanine and Fe-phthalocyanine.

In a further aspect of the present invention, a refrigerator includes acabinet comprising an inner case having the storage room providedtherein and an outer case defining an exterior appearance thereof; asensor unit to detect a contamination source inside the storage room; atleast one door to selectively open and close the storage room; a filterduct arranged between the front case and the rear plate, to flow airinside the inner case therein; a filter module provided in the filterduct, the filter module comprising a steam generation unit to sprayhigh-temperature steam toward the air drawn into the filter duct and afan to adjust air flow inside the filter duct; and a control unit tocontrol the operation of the filter module based on the result of thedetection performed by the sensor unit.

The sensor unit may include at least one of a bio-sensor to detect aspecific bacteria contaminant and a gas sensor to detect an offensivesmell factor. The sensor unit may include a camera unit arranged in thestorage room, to detect and visualize an image of a stored food, and thecontrol unit may determine spoiling of the stored food based on adifference between an image of the stored food pre-memorized therein andthe image of the stored food detected by the camera unit.

The refrigerator may further include a display part provided in a door,to image surface temperature distribution of the stored food visualizedby the camera unit and to display the imaged surface temperaturedistribution to the user. The display part may display the spoiling ofthe stored food determined by the control unit to the user. The cameraunit may detect at least one of a temperature, a color, and a shape ofthe stored food. The control unit may increase cooling load of thestorage room for a preset time period after steam spraying is complete.

The refrigerator may further include a display part to display acontamination status of the storage room detected by the sensor unit tothe user. The sensor unit may include a weight sensor to recognizeweight change of the stored food.

Advantageous Effects

As mentioned above, according to the refrigerator relating to at leastone embodiment, the food stored in the storage room and air inside thestorage room may be sterilized effectively. Also, the storage room maybe maintained clean.

Further, according to the refrigerator relating to at least oneembodiment, the plurality of the storage rooms may be maintained cleanby the sterilization passage independently separated from the cold airpassage.

Still further, according to the refrigerator relating to at least oneembodiment, the storage room may be sterilized and deodorized. Inaddition, remains of dead bacteria may be self-discomposed.

Still further according to the refrigerator relating to at least oneembodiment, allergens that are allergy generation factors may be removedfrom the inside of the storage room. Because of this, the storage roommay be managed more sanitarily and freshness of the stored food may bekept.

Still further, according to the refrigerator relating to at least oneembodiment, the sterilization may be selectively performed based on foodintroduction, internal temperature change, or usage. Because of this,power consumption may be reduced.

Still further, according to the refrigerator relating to at least oneembodiment, kinds and an amount or a smell factor of bacteria located inthe storage room may be detected and the detected information may bedisplayed to the user.

Still further, according to the refrigerator relating to at least oneembodiment, image information relating to a shape or temperaturedistribution of specific food may be acquired and freshness of the foodmay be figured out, to display the freshness of the food to the user.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiments of the disclosure andtogether with the description serve to explain the principle of thedisclosure and in the drawings:

FIG. 1 is a perspective view illustrating a door of a refrigeratoraccording to an embodiment, which is partially open;

FIG. 2 is a perspective view illustrating key parts of a refrigeratoraccording to an embodiment;

FIG. 3 is a conceptual diagram illustrating an example of an operationstatus of a filter module of a refrigerator according to an embodiment;

FIG. 4 is a conceptual diagram illustrating another example of anoperation status of a filter module of a refrigerator according to anembodiment;

FIGS. 5A-5B are front views illustrating key parts of a refrigeratoraccording to an embodiment;

FIGS. 6A-6B and 7 are conceptual diagrams illustrating a multi duct of arefrigerator according to an embodiment;

FIGS. 8 and 9A-9B are conceptual diagrams illustrating an example of anoperation status of a filter module and a multi duct;

FIG. 10 is a block view of a refrigerator according to an embodiment;

FIG. 11 is a diagram illustrating a control method of a refrigeratoraccording to an embodiment;

FIGS. 12A-12B and 13A-13B are graphs illustrating an effect of thefilter module of a refrigerator according to an embodiment;

FIGS. 14A-14B are photographs taken to illustrate an effect of a filtermodule of a refrigerator according to an embodiment;

FIGS. 15A-15B are graphs illustrating an effect of a filter module of arefrigerator according to an embodiment;

FIG. 16 is a conceptual diagram illustrating a filter module of arefrigerator according to an embodiment;

FIG. 17 is a plane view illustrating the filter module and the multiduct of FIG. 16;

FIG. 18 is a perspective view illustrating a door of a refrigeratoraccording to a further embodiment, which is partially open;

FIG. 19 is a block view illustrating the refrigerator of FIG. 18;

FIG. 20 is a plane view illustrating a filter module and a multi duct ofthe refrigerator of FIG. 18;

FIG. 21 is a perspective view illustrating key parts of a camera unit ofthe refrigerator of FIG. 18; and

FIGS. 22 to 25 are photographs taken to illustrate an example of anoperation status of the camera unit shown in FIG. 21.

BEST MODE

As follows, a refrigerator according to an exemplary embodiment of thepresent invention will be described in detail in reference to theaccompanying drawings. The accompanying drawings illustrate examples ofthe present invention and they are provided to explain the presentinvention in more detail. However, the scope of the present invention isnot limited by the drawings.

Regardless of numeral references, the same reference numbers will beused throughout the drawings to refer to the same or like parts andrepeated description will be omitted. The size and appearance of eachelement shown in the drawings may be exaggerated or shrunk.

In the meanwhile, the terms including ordinal numbers such as ‘first’and ‘second’ used in the specification may be used to explain a varietyof elements and the elements are not limited by the terms. The terms areused only for distinguishing one of the elements from the other.

FIG. 1 is a perspective view illustrating a door of a refrigeratoraccording to an embodiment of the present invention, which is partiallyopen. FIG. 2 is a perspective view illustrating key parts of arefrigerator according to an embodiment of the present invention.

The refrigerator 1 according to the embodiment of the present inventionmay be applicable to various types of refrigerators, for example, atraditional top freezer type refrigerator, a side by side typerefrigerator, or a bottom freezer type refrigerator. More specifically,the refrigerator may be a refrigerator including a cabinet 10 having atleast one storage room formed therein for low temperature storage and atleast one door 20 and 30 rotatably coupled to the cabinet 10 toselectively open and close the storage room.

As follows, the side by side type refrigerator widely used in recentyears will be embodied which includes freezer and refrigeratorcompartments located side by side, being selectively closed by doorsprovided respectively, for explanation convenience.

The refrigerator 1 may include a cabinet 10 having at least one storageroom for low temperature storage, a compressor (not shown) provided inthe cabinet 10 to compress refrigerant, at least one door 20 and 30rotatably coupled to the cabinet 10 to open and close the storage room,a filter module 100 mounted in the storage room of the cabinet 10, and acontrol unit (not shown) configured to control operation of the filtermodule 100.

With reference to FIGS. 1 and 2, the refrigerator 1 according to thisembodiment may include the cabinet 10 capable of providing a room inwhich food and food containers may be stored at a relatively lowtemperature and an exterior appearance of the refrigerator. The cabinet10 may have an approximately cube shape, with an open front to receivefood and food containers therethrough.

The cabinet 10 of the refrigerator 1 may include an outer case 10 b andat least one inner case 10 a capable of providing a storage room tofreeze or refrigerate food. With reference to FIG. 2, a cold air duct 60may be arranged between the front plate 11 and the rear plate 12 tosupply cold air to the inside of the storage room 40.

The at least one door 20 and 30 may be rotatably coupled to the openfront of the cabinet 10 to selectively open and close the open front ofthe cabinet 10. FIG. 1 illustrates a side by side type refrigeratorwhich includes a first door 20 and a second door 30 coupled to thecabinet 10 to open and close a left storage room (50, see FIG. 7) and aright storage room 40, respectively.

Various functions may be added to the refrigerator 1 to allow a user touse the refrigerator 1 conveniently. To realize such functions, adispenser 21 and a home bar 31 may be further provided in the doors 20and 30. The user may keep and store a predetermined amount of food orfood containers in the home bar 31, and he or she may dispense purifiedwater or ice from the dispenser 21.

At least one basket 33 may be arranged in a rear surface of the door 30.

Also, in case of the side by side type refrigerator 10, an internalspace of the cabinet 10 may be partitioned into a left room and a rightroom. Commonly, the left room is employed as a freezer compartment (50,see FIG. 7) storing food and food containers at below zero temperaturesand the right room is employed as a refrigerator compartment 40 storingfood and food containers at above zero temperatures.

The freezer compartment 50 may freeze the food stored therein below thezero temperatures, and it is used to store the food for a relativelylong time period. The refrigerator compartment 40 maintains thetemperature lower than room temperature and it is used to store the foodfresh.

A plurality of shelves 51 and 41 may be provided in the freezercompartment (50, see FIG. 7) and the refrigerator compartment 40. Thefood and the food containers may be placed on the plurality of theshelves 51 and 41. Because of the shelves 51 and 41, internal rooms ofthe freezer and refrigerator compartments may be partitioned into aplurality of layered spaces. Also, at least one drawer 52 and 42 may befurther provided in the freezer compartment (50, see FIG. 7) and therefrigerator compartment 40 to receive food, such as fruit orvegetables.

The refrigerator 1 may stored fruit and vegetables, meats, fish, avariety of food materials and related cooking materials. The pluralityof the storage spaces may be formed in the cabinet 10 by the shelves anddrawers. Because of this, separate storage for each kind of food may bepossible.

For example, a single drawer 42 of the drawers provided in therefrigerator compartment 40 may be used as a storage space for fruitand/or vegetables. Another drawer may be used as a storage space formeats or fish. The other drawer 32 provided in the rear surface of thedoor 30 may be used as storage space for grains, such as rice, beans, oradzuki beans.

FIG. 3 is a conceptual diagram illustrating an example of an operationstatus of a filter module of a refrigerator according to an embodiment.FIG. 4 is a conceptual diagram illustrating another example of anoperation status of a filter module of a refrigerator according to anembodiment. FIGS. 5A-5B are front views illustrating key parts of arefrigerator according to an embodiment.

Also, FIGS. 6A-6B and 7 are conceptual diagrams illustrating a multiduct of a refrigerator according to an embodiment. FIGS. 8 and 9A-9B areconceptual diagrams illustrating an example of an operation status of afilter module and a multi duct.

The filter module 100 may include a housing 110 having an air inlet (notshown) and an air outlet (not shown), a plurality of sterilizationfilters 120 arranged in the housing 110, and a fan 130 for sucking airinside the storage space into the filter module 100 and for exhaustingthe sterilized air outside of the housing 110. The housing 110 may havevarious appearances and structures. According to one example inreference to FIG. 2, the housing 100 may include a front housing 111having the air inlet formed therein, a rear housing 113 having the airoutlet formed therein and coupled to a rear side of the front housing111 to arrange the fan 130 therein, and a front panel 112 coupled to afront of the front housing 111.

With such a structure, air inside the storage room 40 may be sucked viaa gap formed between the front panel 112 and the front housing 111. Thesucked air may reach the sterilization filter 120 via the air inletformed in the front housing 111. In addition, the sterilization filter120 may be detachably arranged in the housing, with a replaceablestructure. Also, a slit plate 140 may be arranged in the filter module110 to guide air flow between the sterilization filters 120 and the fan130.

With reference to FIG. 3, the sterilization filters 120 may be composedof a first sterilization filter 121, a second sterilization filter 122,and a third sterilization filter 123 that are sequentially arranged fromthe air inlet toward the air outlet of the housing 110. The first tothird sterilization filters 121, 122 and 123 may perform three steps ofsterilization.

A size of mesh may get smaller from the first sterilization filter 121toward the third sterilization filter 123. For example, the firststerilization filter 121 may have a mesh with a size of approximately100 μm or more. The second sterilization filter 122 may have a mesh witha size of approximately 5 μm or more, and the third sterilization filter123 may have a mesh with a size of approximately 2.5 μm.

In addition, the filter module 100 may include a deodorization filter124 used to deodorize the air having passed the sterilization filters121 to 123.

The filter module 100 having the structure mentioned above may keep theair inside the storage room 40 clean using three steps of sterilizationand a single step of deodorization.

Leuconostoc enzymes may be coated on at least one of the sterilizationfilters 121 to 124. The leuconostoc enzyme is a kind of Kimchi's lacticenzyme and it is highly effective in sterilization. Also, a proteinactivity inhibitor may be additionally coated on the sterilizationfilters 121 to 124, and the sterilization filters 121 to 124 may includean organic/inorganic binder and water. Preferably, a compound ofKimchi's lactic enzyme extract and protein activity inhibitor may becoated on the sterilization filters 121 to 124.

The third sterilization filter 123 may have a zebra pattern (not shown)to increase a coating area of the enzymes. The filter module 100 mayfurther include an anti-allergen filter.

In reference to FIG. 4, a filter module 150 shown in FIG. 4 may includea housing 151 having an air inlet and an air outlet formed therein, afilter box 160 detachably held in the 151, and a fan (not shown)arranged in the housing 151. The filter module 150 shown in FIG. 4 maybe integrally formed with the housing, which is a differentcharacteristic, in comparison with the filter module 100 mentionedabove. Also, the filter box 160 may include a plurality of sterilizationfilters 161 and 162, an anti-allergen filter 163, and a deodorizationfilter 164, which are the same as mentioned above.

The anti-allergen filter 163 may include at least one selected from agroup composed of activated carbon (charcoal), silver (Au), allercatcherfiber, co-phthalocyanine, and Fe-phthalocyanine. The activated carbonmay be T-SCOB impregnated charcoal having encapsulated silver, T-Eimpregnated charcoal to selectively soak ethylene or T-TS impregnatedcharcoal to selectively soak aldehyde that is generated from Doenjang orfermented foods. Such an anti-allergen filter 163 may perform a functionof removing allergens located in the storage room 40.

An object of the embodiments may be to provide a refrigerator that isable to maintain the plurality of the storage rooms via the auxiliarysterilization passage independent from the cold air passage. Withreference to FIGS. 2 and 5 to 7, in the cabinet 10 may be arranged thecold air duct 60 configured to supply cold air to the storage room 40,located in a predetermined space formed between the front plate 11 andthe rear plate 12, and a filter duct 70 that draws the sterilized airfrom the filter module 100 therein, with a plurality of outlets 71 totransport the drawn sterilized-air to the storage room 40. The multiduct 90 may include the cold air duct 60 and the filter duct 70.

With reference to FIGS. 5A-5B, an opening 11 a may be formed in thefront plate 11 to arrange the filter module 100 therein, and a cold airsupply hole 11 b may be formed in the front plate 11 to supply cold airto the storage room. Also, a passing hole 11 c may be provided in theinner case to supply the sterilized-air to the storage room via thefilter duct 70 (second duct). The passing hole 11 c may be located at aposition corresponding to the outlet 71 of the filter duct 70 (secondduct), and sterilized air may be drawn into the front plate 11 via thepassing hole 11 c.

More specifically, the air drawn into the filter module 100 from thestorage room via the air inlet of the housing may be sterilized anddeodorized while passing through the sterilization filters and thedeodorization filter. The sterilized air may be drawn into themulti-duct 70 along the opening 11 a of the inner case, after passingthrough the air outlet of the housing 110. Hence, the sterilized airflowing inside the filter duct 70 (second duct) passes through theoutlet 71 of the filter duct 70 (second duct) and the passing hole 11 cof the front plate 11, sequentially, to be supplied to the storage room.

The cold air duct 60 may be formed to surround the filter duct 70(second duct) to make better use of a space formed between the innercase and the rear plate 12. Also, with reference to FIG. 6B, alongitudinal end (Z1) of the filter duct 70 (second duct) may beconnected with the cold air duct 60, to draw the sterilized air into thefront plate 11 together with the cold air. With reference to FIG. 7, alongitudinal end (Z2) of the filter duct 70 (second duct) may beseparated from the cold air duct 60, to draw the sterilized air into theinner case separate from the cold air.

With reference to FIG. 8, inner spaces 40 and 50 of the front plate 11may be partitioned into a plurality of storage sections 40-1 to 40-3 bythe shelves 41 and 51. The filter module 100 may be arranged in aspecific area (A to R) of each storage section. As mentioned above, whenthe filter module 100 is arranged in a specific area of one of thestorage sections (for example, 40-2), the sterilized air may be suppliedto storage sections 40-1 and 40-3 via the filter duct 70 (second duct)mentioned above. Also, at least one outlet 71 of the filter duct 70(second duct) and at least one passing hole 11 c of the front plate 11may be provided in each of the storage sections 40-1 to 40-3.

With reference to FIG. 6B, the cold air duct 60 and the filter duct 70(second duct) may be connected with each other at some area (Z1). Withthis structure, the cold air and the sterilized air may be supplied tothe storage room together.

So far, it is described that the sterilized air exhausted from thefilter module 100 may be supplied to neighboring storage sections (40-1to 40-3) via the filter duct 70 (second duct). However, different fromthis, with reference to FIGS. 9A-9B, an air path may be formed in afront surface or a side surface of the filter module and the sterilizedair may be then circulated into the storage sections directly, not viathe filter duct 70 (second duct).

It is shown in FIGS. 9A-9B that the sterilized air may be exhausted viaa front surface of the filter unit 100, with air inside the storagesections being drawn into the filter unit 100 via at least one sidesurface of the filter unit 100. Also, it is shown that the sterilizedair is exhausted via at least one side surface of the filter unit 100,with the air inside the storage room being drawn via the front surfaceof the filter unit 100. However, the present invention is not limitedthereby and the filter unit 100 may be arranged, spaced apart a properdistance from an inner circumferential surface of the inner case.

According to an example, the air inside the storage may be drawn via thefront surface of the filter unit 100, and the sterilized air may beexhausted via the space between the filter unit 100 and the front plate11.

FIG. 10 is a block view of a refrigerator according to an embodiment.FIG. 11 is a diagram illustrating a control method of a refrigeratoraccording to an embodiment. FIGS. 12A-12B and 13A-13B are graphsillustrating an effect of a filter module of a refrigerator according toan embodiment. FIGS. 14A-14B are photographs taken to illustrate aneffect of the filter module of the refrigerator according to anembodiment. FIGS. 15A-15B are graphs illustrating an effect of thefilter module of the refrigerator according to an embodiment.

FIG. 11 is a block view illustrating key parts of a control unit of arefrigerator relating to an embodiment.

The refrigerator 1 relating to this embodiment may include a controlunit 80 configured to control operation of the filter module 100. Thecontrol unit 80 may be a central control unit to control an overalloperation of the refrigerator or a local control unit to control onlythe operation of the filter module 100.

The control unit 80 may include an input part 81 to input a controlcommand, such as on/off, and an operational mode of the filter module100, and a display part 82 to display to the user a status of thestorage room, an operational status of the filter module 100, or areplacement cycle of the filter module 100. In addition, the input part81 may include a refrigerator compartment temperature adjusting part, afreezer compartment temperature adjusting part, and a special storageroom temperature adjusting part. Also, the input part 81 may include anoperational mode selecting part and a lock setting/unlock inputting partfor each storage room.

The refrigerator 1 may include various sensors to acquire information ona status of the storage room 40. For example, it may include atemperature sensor 83 to measure a temperature of either of the storagerooms 40 and 50 and a door sensor 84 to determine whether to open thedoors 20 and 30.

The status information of the storage room 40 may include at least oneof operation mode information, operation temperature information, dooropening information, lock-setting information, and abnormal statusinformation. More specifically, the display part 82 may display anoperation temperature for a specific storage section requiring specialtreatment (for example, a drawer and a storage box), together with anoperation temperature for each of the refrigerator and freezercompartments.

The operation mode of the filter module 100 may include a manual mode inwhich the user inputs on/off selectively, if necessary, and anauto-mode, in which on/off is automatically implemented based on apreset operation condition.

Operation conditions of the auto-mode may be preset based on anintegrated time of the compressor, a frequency, and/or a time of dooropening.

According to one example, the control unit 80 may operate the filtermodule 100 for a predetermined time period, once a preset integratedtime of the compressor has passed.

The control unit 80 may control the filter module to be on for a firsttime period and to be off for a second time period. The control unit 80may repeat the on and off of the filter module multiple times. Forexample, the integrated time of the compressor may be approximately 5hours. The first time period may be approximately 10 minutes and thesecond time period may be approximately 5 minutes.

Alternatively, the control unit 80 may control the filter module 100 tobe driven for a preset time period based on opening and closing of thedoor 20, in other words, when the door 20 is opened and closed. Thecontrol unit 80 may control the filter module 100 to be driven for thepreset time period when the door is closed, based on at least one of theopening/closing frequency of the door and the opening time of the door.

In other words, when the door is closed after being opened, it may belikely that food storage is performed and external air may be drawn intothe storage room. Because of this, sterilization may be performed usingthe filter module 100.

With reference to FIG. 11, an example will be described in detail inwhich the filter module 100 is driven by the control unit 80 in anauto-mode according to an example.

First, considering the user's use status, the frequency and time of thedoor opening may increase in breakfast/lunch/dinner hours and operationconditions of the filter module 100 may be determined based on suchactual use cycle. Also, an operation period of the compressor may bedetermined based on the actual use cycle mentioned above. The compressormay be driven for an approximately 8 hour period three times a day. Thecompressor may be stopped to operate for 3 hours after being driven foran integrated (accumulative) 5 hours.

The filter module 100 may be driven three times at intervals ofapproximately 8 hours according to the operation period of thecompressor. In other words, when the filter module 100 may beautomatically driven for approximately 2 (integrated) hours by thecontrol unit 80, when the integrated time of the compressor is 5 hours.At this time, the filter module 100 may be operated for approximately 2hours (8 times), repeating the driving for 10 minutes before stoppingfor 5 minutes.

Alternatively, the filter module 100 may be operated in a power modewhen a large amount of food is stored in the storage room or strongsterilization is required. According to one example, the filter modulemay be operated for about 4 hours (16 times), repeating the driving for10 minutes and stopping for 5 minutes (one time). In the meanwhile, thecontrol unit 80 may stop the driving of the filter module, when the dooris opened during the driving of the filter module 100, and it may drivethe filter module 100 for the remaining time with the remainingfrequency after the door is closed.

When a defrost operation starts during the driving of the filter module100, the control unit 80 may stop the driving of the filter module. Thecontrol unit 80 may drive the filter module 100 for the remaining timewith the remaining frequency after the defrost operation has finished.

FIGS. 12A-12B and 13A-13B are graphs to describe a sterilization effectof the refrigerator 1 relating to an embodiment. FIGS. 12A and 13Aillustrate experimental data, targeted at chicken and FIGS. 12B and 13Billustrate experimental data, targeted at beef.

With reference to FIGS. 12A-12B, “R1” and “R2” refer to the viablemicrobe cell number according to passage of days when the filter module200 is not applied. “L1” and “L2” refer to the viable microbe cellnumber according to passage of days when the filter module 100 isapplied. With reference to FIG. 12A, approximately 32% of the viablemicrobe cell number may be decreased after 14 days when the filtermodule 100 is applied. With reference to FIG. 12B, approximately 91% ofthe viable microbe cell number may be decreased after 14 days when thefilter module 100 is applied.

With reference to FIGS. 13A-13B, “R3” and “R4” refer to the viablemicrobe cell number according to passage of days when the compound ofkimchi lactobacillus extract and protein activity inhibitor is notcoated on the filter module 100. “L3” and “L4” refer to the viablemicrobe cell number according to passage of days when the compound ofkimchi lactobacillus extract and protein activity inhibitor is coated onthe filter module 100. With reference to FIG. 13A, it is shown thatapproximately 49% of the viable microbe cell number is decreased after 2days, when the compound of kimchi lactobacillus extract and proteinactivity inhibitor is coated on the filter module 100. In reference toFIG. 13B, it is shown that approximately 23% of the viable microbe cellnumber is decreased after 3 days, when the compound of kimchilactobacillus extract and protein activity inhibitor is coated on thefilter module 100.

With reference to FIGS. 14A-14B, FIG. 14A is a photograph of an airsample collected after being forcibly circulated by the fan, withspraying bacteria, when the filter module 100 is not applied to a presetexperiment chamber, and FIG. 14B is a photograph of an air samplecollected after forcibly circulated to pass the filter module 100 by thefan, with spraying bacteria, when the filter module 100 is applied to apreset experiment chamber. According to the photographs, it is shownthat approximately 99.8% of the bacteria are reduced when the filtermodule 100 is applied.

FIGS. 15A-15B is graphs illustrating decrease of contaminants when thefilter module 100 is operated after arranged in a storage room of arefrigerator. FIG. 15A illustrates an effect in case of performing anexperiment that uses microbial medium, and it is shown thatapproximately 37% of microbes are decreased. FIG. 15B illustrates aneffect in case of performing an experiment that uses chopped chicken,and it is shown that approximately 25% of microbes are decreased.

Also, experimental data for a decreasing rate of various microbes incase of using the filter module 100 is as follows:

TABLE 1 Experiment Experiment Decreasing Rate Method ProtocolEnvironment Microbe 0 min. 15 min. 30 min. 60 min. Shaking ASTM 35% E.coli 65.57% 99.98% >99.98% >99.99% flask E2149-01 ATCC 11229 S. aureus  25% 91.25% 99.42% >99.99% ATCC 6538 S.enteria >99.95%  >99.99% >99.99% >99.99% ATCC 13311 L. mono- 63.13%60.71% >99.99% >99.99% cytogenes ATCC 19114 Shaking ASTM  3% E. coli21.43% 7.41% 71.07% 92.86% Flask E2149-01 ATCC 11229 S. aureus >99.99%37.04% 69.26% ATCC 6538 S. enteria 99.79% 21.05% >99.99% >99.99% ATCC13311 L. mono- 10.53% 21.05% 26.32% 76.84% cytogenes ATCC 19114

TABLE 2 Decreasing Experiment Experiment Rate (After Method ProtocolEnvironment Microbe 24 hours) Shaking FITI 35% E. coli >99.99% flaskFC-TM-19 ATCC 11229 S. aureus >99.99% ATCC 6538 S. enteria >99.99% ATCC13311 L. mono- >99.99% cytogenes ATCC 19114 Feline calicivirus >99.99%

TABLE 3 Decreasing Experiment Experiment Rate (After Method ProtocolEnvironment Microbe 24 hours) Shaking FITI 4% E. coli >99.99% flaskFC-TM-19 ATCC 11229 S. aureus 88.70% ATCC 6538 L. mono- 94.20% cytogenesATCC 19114

As mentioned above, according to the refrigerator relating to at leastone embodiment, food stored in the storage room and air inside thestorage room may be sterilized effectively, to keep the storage roomclean.

FIG. 16 is a conceptual diagram illustrating a filter module of arefrigerator according to an embodiment. FIG. 17 is a plane viewillustrating the filter module and the multi duct shown in FIG. 16. Therefrigerator according to this embodiment may include a case having atleast one storage room for low temperature storage, a compressorprovided in the case to compress refrigerant, at least one door to openand close the storage room, a filter module 200 having at least one UVlighting source 21 to irradiate UV light toward the storage room and aphotocatalyst filter 220 to filter the air having the UV irradiatedthereto, and a control unit to control operation of the filter module200.

The refrigerator according to this embodiment is the same as therefrigerator according to the embodiment mentioned above, except for thefilter module. As follows, the only difference will be described indetail and description of the other repeated components will be omittedaccordingly.

Titanium may be coated on the photocatalyst filter 220. With referenceto FIG. 16, the UV lighting source 210 may irradiate UV light toward theair inside the storage room. Once bacteria contained in the air is deadbecause of the UV light, remnants of the dead bacteria may decomposebecause of the titanium-coated photocatalyst filter 220. As a result,the filter module 200 may have a remnants-removing effect, as well as asterilization effect.

Also, the filter module 200 may further include an anti-allergen filter.The anti-allergen filter is the same as described above.

In the meanwhile, the filter module 200 may have various structures.According to one example of the structure, the filter module 200 mayinclude a housing (not shown) having an air inlet and an air outletformed therein, and a fan 230 arranged adjacent to the air outlet of thehousing. The UV lighting source 210 may be arranged adjacent to the airinlet inside the housing, and the photocatalyst filter 220 may bearranged adjacent to the air outlet inside the housing.

As it is the same as the refrigerator mentioned above with reference toFIGS. 2 to 6, the case of the refrigerator may include an inner casethat defines the storage room and an outer case that defines an exteriorappearance of the refrigerator. A cold air duct 60 and a filter duct 70(second duct) may be provided in a predetermined space formed betweenthe inner case and the outer case to provide cold air to the storageroom and to provide a passage for sterilization, respectively.

With reference to FIG. 17, the filter module 200 may be arranged in thefilter duct 70 (second duct). In this case, an inlet 72 to draw airinside the storage room and an outlet 71 to exhaust the sterilized airto the storage room may be provided in the filter duct 70 (second duct).

According to one example, a plurality of the UV lighting source 210 maybe arranged in an inner circumferential surface of the filter duct 70(second duct), spaced apart a proper distance from each other, toirradiate UV light toward the air. A fan 230 may be arranged in thefilter duct 70 (second duct).

Also, a passing hole may be provided in the inner case, corresponding tothe outlet 71 of the filter duct 70 (second duct). The sterilized airmay be drawn into the inner case via the passing hole.

As mentioned above, the inner case may be partitioned into a pluralityof storage sections. At least one passing hole of the inner case may beprovided for each of the storage sections. In other words, thesterilized air may be supplied to each of the storage sections via thefilter duct 70 (second duct) as mentioned above.

The UV lighting source 210 may be operated based on at least one of alight emitting time, a light emission intensity, and a light emissionperiod that are stored in the control unit. The UV lighting source 210may be operated based on at least one of an opening status of the door,and a change in temperature inside the storage room.

Also, the control unit may include an input part to input controlcommands, such as on and off, of the UV lighting source, a lightemission duration time, a light emission intensity (for example, strong,middle and weak), and a light emission period, and a display part todisplay a status of the storage room. In addition, the input part mayinclude a refrigerator compartment temperature adjusting part, a freezercompartment temperature adjusting part, and a special storage roomtemperature adjusting part. Also, the input part may include anoperational mode selecting part and a lock setting/unlock inputting partfor each storage room.

The status information of the storage room may include at least one ofoperation mode information, operation temperature information, dooropening information, lock-setting information, and abnormal statusinformation. More specifically, the display part may display anoperation temperature for a specific storage section requiring specialtreatment (for example, a drawer and a storage box), together with anoperation temperature for each of the refrigerator and freezercompartments.

Also, the display part may be a liquid crystal display, and it may beconfigured of a plurality of light emitting diodes (LED) capable ofdisplaying numbers, characters, and various symbols.

The UV lighting source 210 may be operated based on at least one of thelight emission duration time, the light emission intensity (for example,strong, middle and weak), and the light emission period stored in thecontrol unit. The light emission duration time, the light emissionintensity, and the light emission period may be preset by the user, suchthat the UV lighting source 210 may be controlled by the control unitconstantly (auto-mode). Alternatively, they are input by the user at thetime when he or she desires to drive the UV lighting source 210, suchthat the UV lighting source 210 may be controlled intermittently(manual-mode).

The control unit may control operation of the UV lighting source 210based on a temperature change inside the storage room. According to oneexample, when the temperature of the storage room is a predeterminedreference value or more, the control unit may operate the UV lightingsource 210 for a preset time period.

The reference value may be determined based on a result of experiments,for example, 2 to 6, and it may be approximately 3. When the temperaturechange inside the storage room is the reference value or more, thecontrol unit may expect that the food stored in the storage room couldbe contaminated, and it may then operate the UV lighting source 210.

The control unit may control the operation of the UV lighting sourcebased on an opening status of the door, an opening frequency of thedoor, or an opening time of the door. For example, the control unit mayoperate the UV lighting source 210 for a preset time period after thedoor is opened and closed, and it may not operate the UV lighting source21 until the door is open and closed the next time.

In other words, there might be concern of contamination that can occurto food contained in the storage room when new food is accommodated inthe storage room. Because of this, the control unit may control theoperation of the UV lighting source 210 based on the status of the dooropening, the frequency of the door opening or the duration time of thedoor opening.

In the meanwhile, so far, the embodiment that the operation of the UVlighting source 210 is controlled based on the status of the dooropening or temperature change inside the storage room is described, butthe present invention is not limited thereby. The operation of the UVlighting source 210 may be controlled based on both of the door openingstatus and the storage room temperature change.

For example, when the temperature inside the storage room is increasedup to a reference value or more after the door is open and closed, thecontrol unit may operate the UV lighting source 210 for a preset timeperiod. Until the temperature inside the storage room is increased up tothe reference value or more after the door is open and closed next time,the control unit may not operate the UV lighting source 210.

When the UV lighting source 210 is operated in the refrigeratorconstantly, plastic material inside the refrigerator (an innercircumferential surface of the storage room and a food container) mightbe discolored even after the sterilization. Because of this, a replacinginterval of the plastic material happens fast.

As a result, according to the refrigerator 1 according to the firstembodiment described above, the filter module 200 may be arranged in thefilter duct 70 (second duct). Because of this, discoloration generatedin the inner circumferential surface of the storage room and the foodcontainer may be prevented and usage of the UV lighting source 210 maybe lengthened.

Also, in a case of concern over contamination of food, sterilization maybe selectively performed based on the introduction of food or internaltemperature change. Because of this, power consumption may be reduced.

FIG. 18 is a perspective view illustrating a door of a refrigeratoraccording to a further embodiment, which is partially open. FIG. 19 is ablock view illustrating a refrigerator according to the embodiment ofFIG. 18. FIG. 20 is a plane view illustrating a filter module and amulti duct of the refrigerator of FIG. 18. FIG. 21 is a perspective viewillustrating key parts of a camera unit of the refrigerator of FIG. 18.

A refrigerator 1 according to this embodiment may include a cabinet 10having an inner case defining at least one storage room formed thereinfor low temperature storage of food and an outer case defining anexterior appearance thereof, a sensor unit 510 detecting a source ofcontamination inside the storage room, and at least one door 20 and 30selectively opening and closing the storage room.

Also, the refrigerator may include a filter duct 70 (second duct)arranged between the inner case and the outer case to flow air insidethe inner case therein, a filter module 300 having a steam generationunit 310 provided in the filter duct 70 (second duct) to spray hightemperature gas toward the air drawn into the filter duct 70 (secondduct) and a fan 320 to adjust air flow inside the filter duct 70 (secondduct), and a control unit 500 to control operation of the filter module300 based on the result of the detection performed by the sensor unit510.

The refrigerator 1 of this embodiment is the same as the refrigeratoraccording to the embodiment described with reference to FIG. 1, exceptfor the sensor unit 510 and the filter module 300. As follows, thedifference will be described in detail and the other repeateddescription of the same components will be omitted accordingly.

The sensor unit 510 may include at least one of a bio-sensor 511 todetect a specific bacteria contaminant and a gas sensor 512 to detect anoffensive smell factor. As mentioned above, the sensor unit 510 mayinclude a weight sensor 513 to measure the weight of the stored goods(for example, food) seated in the storage room and a temperature sensor514 to identify information on a status inside the storage room 40.

In addition, the refrigerator 1 may further include a microbial responseviewer (MRV) system 600 that is a simulation program configured tomanage microbes for each kind of food based on temperature, pH,humidity, Aw, and the surrounding environments. The MRV system 600 mayperform a function of analyzing the kind and amount of the bacteriadetected by the bio-sensor 511.

The control unit 500 may include an input part 501 to input controlcommands relating to the operation of the filter module, such as on andoff, of the steam generation unit and the fan, a steam spray time, asteam intensity (for example, strong, middle and weak), and a steamspray period, and a display part 502 to display a status of the storageroom.

The input part 501 may include a refrigerator compartment temperatureadjusting part, a freezer compartment temperature adjusting part, and aspecial storage room temperature adjusting part. Also, the input partmay include an operational mode selecting part and a lock setting/unlockinputting part for each storage room.

The display part 502 may display an operation temperature for a specificstorage section requiring special treatment (for example, a drawer and astorage box), together with an operation temperature for each of therefrigerator and freezer compartments. One of the doors (for example,the door 20) may have the display part 502 arranged in an outercircumferential surface thereof.

The bio-sensor 511 may be an optical type bio-sensor and it may be ableto detect food-poisoning bacteria located in the refrigerator. The gassensor 512 may detect an offensive smell factor generated in the storageroom 40. When the detected smell factor is a preset concentration ormore, the control unit 500 may drive the filter module 300.

Also, the control unit 500 may determine a spraying time and steamtemperature of the filter module based on the kind and amount of thebacteria detected by the bio-sensor 511 and the MRV system 600. Thecontrol unit 500 may control the display part 502 to display acontamination status inside the storage room that is detected by thesensor unit 510 to the user.

With reference to FIG. 20, the filter module 300 may be arranged in thefilter duct 70 (second duct). In this case, an inlet 72 to draw airinside the storage room and an outlet 71 to exhaust the sterilized airto the storage room may be provided in the filter duct 70 (second duct).

According to one example, a plurality of the steam generating units 310may be arranged in an inner circumferential surface of the filter duct70 (second duct), spaced apart a proper distance from each other, tospray high-temperature steam toward the air. A fan 320 may be arrangedin the filter duct 70 (second duct).

Also, a passing hole may be provided in the inner case, corresponding tothe outlet 71 of the filter duct 70 (second duct). The sterilized airmay be drawn into the inner case via the passing hole.

As mentioned above, the inner case may be partitioned into a pluralityof storage sections. At least one passing hole of the inner case may beprovided for each of the storage sections. In other words, thesterilized air may be supplied to each of the storage sections via thefilter duct 70 (second duct) as mentioned above.

Once the steam spraying is complete, the control unit 500 may increase acooling load of the storage room for a preset time period. In otherwords, when the high-temperature steam is sprayed to the cold air insidethe storage room to perform the sterilization, the temperature insidethe storage room may be increased, and there might be concern about foodspoiling, which has to be prevented in advance.

With reference to FIG. 21, the sensor unit 510 may include a camera unit400 arranged in a storage room 42 to detect an image of the stored foodto visualize the stored food. The control unit 500 may determinespoiling of the stored food based on a difference between an image ofthe stored food memorized in advance and the image of the stored fooddetected by the camera unit 400. The camera unit 400 may detect at leastone of temperature, color, and shape of the stored food.

Also, the display part 502 may image surface temperature distribution ofthe visualized stored food to display the imaged surface temperaturedistribution to the user. Also, the display part 502 may display theresult of determination on the spoiling of the stored food performed bythe control unit 500 to the user.

The camera unit 400 may detect and visualize images of fruit orvegetables stored in the storage room (for example, the drawer 42). Inother words, the refrigerator 1 relating to this embodiment may analyzefreshness and spoiling of stored food nondestructively using imageprocessing technology. The control unit 500 may process the acquiredimage information and display the processed information to the user viathe display part 502.

With reference to FIG. 21, according to one example, the control unit500 may determine whether a stored apple is spoiled based on adifference among distributed surface temperatures of the applevisualized by the camera unit 400. In other words, a surface temperatureof a plant may be determined by an environmental factor andtranspiration (evaporative water via stomata of a plant emits extraheat). If a plant tissue damages because of various stresses, the plantcloses the stomata and the closed stomata fails to perform thetranspiration. The damaged tissue that fails to generate thetranspiration may fail to emit the heat. Because of this, a surfacetemperature of the plant may increase.

FIGS. 22 to 25 are photographs taken to illustrate an example of anoperation status of the camera unit of FIG. 21. With reference to FIGS.22 and 23, the control unit 500 may control the camera unit 400 tovisualize surface temperature distribution of fruit and vegetablesstored in the storage room 42 every preset time. The control unit 500may compare the surface temperatures of the fruit and vegetables witheach other. When the difference among the surface temperatures is out ofa preset temperature range, the control unit 500 may determine that thefruit and vegetables are spoiled.

The camera unit 400 may detect an infrared light radiated from the fruitand vegetable according to active thermography and passive thermography.That is, according to the active thermograph, a heat source is suppliedto an object and an infrared light radiated from the object is detected.According to the passive thermograph, an infrared light self-radiatedfrom the object is detected.

As a result, when the surface temperature distribution of the fruit andvegetables is visualized according to the active thermograph, a heatsource part (not shown) may be provided in the storage room 42 to supplyheat to the, fruit and vegetables stored in the storage room 42. Thecamera unit 400 may detect an infrared light radiated from thevegetables and the fruits supplied the heat by the heat source part, tovisualize the surface temperature distribution. When the surfacetemperature distribution of the fruit and vegetables is visualizedaccording to the passive thermograph, the camera unit 400 may detect aninfrared light self-radiated from the fruit and vegetables supplied theheat by the heat source part, to visualize the surface temperaturedistribution.

The display part 502 provided in an outer surface of the door 20 mayimage surface temperature distribution of the fruit and vegetablesvisualized by the camera unit 400, and it may display the imaged surfacetemperature distribution to the user at a predetermined interval. As aresult, the user may recognize a quality status of the fruit andvegetables stored currently by looking at the surface temperaturedistribution of the fruit and vegetables stored in the storage room 42via the display part 502.

The surface temperature distribution of the fruit and vegetables that isvisualized by the camera unit 400 may be memorized in a memory part (notshown). The control unit 500 may determine the spoiling of the fruit andvegetables stored in the storage room 42 based on the difference amongthe distributed surface temperatures stored in the memory part. That is,when the surface temperature distribution of the fruit and vegetablesmeasured at preset intervals is out of a preset temperature range, thecontrol unit 500 may determine that tissues of the fruit and vegetablesare damaged.

With reference to FIG. 22, fruit, such as an apple, may acquire a yellowcolor generally, to have a relatively low surface temperaturedistribution. However, as time passes, the tissue of the apple may bedamaged and the stomata closed. Because of this, the transpiration failsto happen and the surface temperature of the apple increases.

With reference to FIG. 23, when the tissue of the fruit, such as anapple, is damaged as time passes, the fruit may acquire a red coloraround the damaged tissue to have a relatively high surface temperaturedistribution. In this case, the control unit 500 may compare the imagedsurface temperature distribution of the apple before a preset timepasses with the imaged surface temperature distribution after the presettime has passed. If the difference of the surface temperaturedistributions is out of a preset temperature range, the control unit maydetermine that the tissues of the fruit and vegetables are damaged.

When determining that the tissues of the fruit and vegetables aredamaged, the control unit 500 may display the spoiling of the fruit andvegetables to the user via the display part 502, and it may also displaya message of consuming or discarding the fruit and vegetables. As aresult, the user can discard or consume right away when the tissues ofthe fruit and vegetables stored in the storage room 42 are damaged. In acase that the fruit and vegetables are spoiled, the spoiled fruit andvegetables may be removed from the refrigerator and generation ofoffensive smell may be prevented. Also, the possibility of the user'ssuffering from a disease caused by eating of the spoiled fruit andvegetables may be reduced.

FIG. 24 includes photographs showing change in shape and color of foodstored in the storage room 42 provided in the refrigerator according tothis embodiment, for example, spinach and pac-choi. With reference toFIG. 24, vegetables, such as spinach and pac-choi, acquire a green colorgenerally right after being stored in the storage room 42, which meansthat a fresh status is maintained.

However, as a preset time period passes, tissues of the spinach and thepac-choi are damaged, and the color of spinach and the pac-choi ischanged because of oxidation. In other words, as shown in the lowerphotographs of FIG. 24, a yellow color may increase around the damagedtissues and an original color thereof may fade gradually, if the tissuesof the spinach and the pac-choi are damaged.

In this case, the control unit 500 may compare an imaged surface colorof the spinach and pac-choi before a preset time period has passed andan imaged surface color thereof after the preset time period has passed.When the difference between the surface colors is out of a preset colorrange, the control unit 500 may determine that the tissues of the fruitand vegetables are damaged.

With reference to FIG. 25, according to another example, when meat, suchas pork and beef, is stored in the storage room 42, an overall shape ofthe meat right after being stored in the storage room may be maintainedalmost the same as a shape of an outer surface of the meat.

However, as time passes, tissues of the meat may be damaged and juicemay come out of the meat. Because of this, an overall outer shape of themeat may change at a surface at which the juice collects.

In this case, the control unit 500 may compare imaged shapes of the meatbefore and after a preset time has passed with each other. When adifference between the shapes is out of a preset shape range, thecontrol unit 500 may determine that the tissues of the meat are damaged.

A user may change the preset shape range to a desired range by using thebutton part 220.

When determining that the tissues of the meat and the tissues of thefruit and vegetables are damaged, the control unit 500 may display tothe user that juice is coming out of the meat, and that the color of thefruit and vegetables has changed via the display part 502. At the sametime, the control unit 500 may display a message of consuming ordiscarding the meat and the fruit and vegetables.

As a result, when the tissues of the meat and the fruit and vegetablesstored in the storage room 42 are damaged, the user may consume ordiscard them immediately. Because of this, the spoiled food may beremoved from the refrigerator quickly if the food is spoiled, andoffensive smells may be prevented.

Also, the possibility of the user's suffering from a disease caused byeating spoiled meat, fruit, and vegetables may be reduced.

As described above, according to the refrigerator relating to at leastone embodiment, food stored in the storage room and air inside thestorage room may be sterilized effectively. Also, the storage room maybe maintained clean.

Further, according to the refrigerator relating to at least oneembodiment, the plurality of the storage rooms may be maintained cleanby the sterilization passage independently separated from the cold airpassage.

Still further, according to the refrigerator relating to at least oneembodiment, the storage room may be sterilized and deodorized. Inaddition, remains of dead bacteria may be self-discomposed.

Still further according to the refrigerator relating to at least oneembodiment, allergens that are allergy generation factors may be removedfrom the inside of the storage room. Because of this, the storage roommay be managed more sanitarily and freshness of the stored food may bekept.

Still further, according to the refrigerator relating to at least oneembodiment, the sterilization may be selectively performed based on thefood introduction, the internal temperature change or the usage. Becauseof this, power consumption may be reduced.

Still further, according to the refrigerator relating to at least oneembodiment, a kinds and amount or the smell factor of bacteria locatedin the storage room may be detected and the detected information may bedisplayed to the user.

Still further, according to the refrigerator relating to at least oneembodiment, image information relating to shape or temperaturedistribution of specific food may be acquired and freshness of the foodmay be figured out, to display the freshness of the food to the user.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the invention. Thus, it isintended that the present invention cover the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

What is claimed is:
 1. A refrigerator, comprising: a cabinet having atleast one storage compartment; at least one door that selectively opensand closes the case the at least one storage compartment; a plurality ofshelves vertically disposed within the at least one storage compartment,that partitions the at least one storage compartment into a plurality ofstorage sections; a first duct mounted on a rear wall of the at leastone storage compartment to supply cold air, wherein the first ductbranches into a plurality of cold air passages and includes a pluralityof cold air supply holes that supplies the cold air into the pluralityof storage sections; and a filter module mounted between the pluralityof cold air passages, the filter module comprising: a filter configuredto filter air within the at least one storage compartment; at least oneUV light source that irradiates an ultraviolet light toward the filter;a fan that draws air into the at least one storage compartment; and asecond duct provided between the plurality of cold air passages tosupply the filtered air, the second duct having at least one passinghole.
 2. The refrigerator of claim 1, wherein the filter furthercomprises a photocatalyst filter.
 3. The refrigerator of claim 2,wherein the photocatalyst filter is coated with titanium.
 4. Therefrigerator of claim 1, wherein the UV light sources comprises a UV LEDdisposed within the second duct.
 5. The refrigerator of claim 4, furthercomprising a controller that selectively drives the fan and the UV LED.6. The refrigerator of claim 5, further comprising an input thatreceives input of an operational mode of the filter module.
 7. Therefrigerator of claim 6, further comprising a display that displays theoperational mode of the filter module.
 8. The refrigerator of claim 1,further comprising: a sensor that senses a status of stored goods withinthe at least one storage compartment; and a controller that controls anoperation of the filter module based on a detection result of thesensor.
 9. The refrigerator of claim 8, wherein the filter modulecomprises: at least one steam generator.
 10. The refrigerator of claim9, wherein the sensor comprises at least one of: a bio-sensor thatdetects a specific bacteria contaminant; a gas sensor that detects anoffensive smell; a weight sensor that measures a weight of stored goods;or a temperature sensor that senses a temperature of the at least onestorage compartment.
 11. The refrigerator of claim 10, wherein thesensor comprises a bio-sensor.
 12. The refrigerator of claim 11, furthercomprising: a microbial response viewer (MRV) system that managesmicrobes for each of a predetermined kind of stored goods.
 13. Therefrigerator of claim 12, wherein the controller controls a sprayingtime and a spraying temperature of the at least one steam generatorbased on a kind and amount of bacteria detected by the bio-sensor andMRV system.
 14. The refrigerator of claim 8, further comprising adisplay that displays a contamination status of the at least one storagecompartment.
 15. The refrigerator of claim 8, wherein the controllercomprises: an input that receives input of control commands for thefilter module from a user.
 16. The refrigerator of claim 8, furthercomprising: a camera that captures an image of stored goods in the atleast one storage compartment.
 17. The refrigerator of claim 16, whereinthe controller determines a contamination status and spoiling of storedgoods based on a comparison between an image of the stored goodspreviously captured by the camera and a currently captured image. 18.The refrigerator of claim 16, wherein the camera is capable of detectingat least one of surface temperature distribution, color, or shape of thestored goods.
 19. The refrigerator of claim 1, wherein air flow throughthe second duct does not cross with air flow through the first duct 20.The refrigerator of claim 1, wherein the filter comprises at least onesterilization filter.
 21. The refrigerator of claim 20, wherein the atleast one sterilization filter is coated with a leuconostoc enzyme. 22.The refrigerator of claim 20, wherein the filter further comprises adeodorization filter.
 23. The refrigerator of claim 5, wherein the UVlight source is operated based on at least one of a light emissionduration time, a light emission intensity, or a light emission periodstored in the controller.
 24. The refrigerator of claim 23, wherein thelight emission duration time, the light emission intensity, and thelight emission period are preset by a user, such that the UV lightsource is controlled by the controller constantly.
 25. The refrigeratorof claim 5, wherein the controller controls operation of the UV lightsource based on a temperature change inside the at least one storagecompartment.
 26. The refrigerator of claim 25, wherein when thetemperature of the at least one storage compartment is a predeterminedreference value or more, the controller operates the UV light source fora predetermined period of time.
 27. The refrigerator of claim 5, whereinthe controller controls an operation of the UV light source based on anopening status of the door, an opening frequency of the door, or anopening time of the door
 28. The refrigerator of claim 27, wherein thecontroller operates the UV light source for a predetermined period oftime after the door is opened and closed, and does not operate the UVlight source until the door is open and closed a next time.